[userspace-rcu.git] / include / urcu / wfqueue.h

// SPDX-FileCopyrightText: 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
//
// SPDX-License-Identifier: LGPL-2.1-or-later

#ifndef _URCU_WFQUEUE_H
#define _URCU_WFQUEUE_H

/*
 * Userspace RCU library - Queue with Wait-Free Enqueue/Blocking Dequeue
 */

#include <pthread.h>
#include <urcu/compiler.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef CDS_WFQ_DEPRECATED
#define CDS_WFQ_DEPRECATED	\
	CDS_DEPRECATED("urcu/wfqueue.h is deprecated. Please use urcu/wfcqueue.h instead.")
#endif

/*
 * Queue with wait-free enqueue/blocking dequeue.
 * This implementation adds a dummy head node when the queue is empty to ensure
 * we can always update the queue locklessly.
 *
 * Inspired from half-wait-free/half-blocking queue implementation done by
 * Paul E. McKenney.
 */

struct cds_wfq_node {
	struct cds_wfq_node *next;
};

struct cds_wfq_queue {
	struct cds_wfq_node *head, **tail;
	struct cds_wfq_node dummy;	/* Dummy node */
	pthread_mutex_t lock;
};

#ifdef _LGPL_SOURCE

#include <urcu/static/wfqueue.h>

static inline CDS_WFQ_DEPRECATED
void cds_wfq_node_init(struct cds_wfq_node *node)
{
	_cds_wfq_node_init(node);
}

static inline CDS_WFQ_DEPRECATED
void cds_wfq_init(struct cds_wfq_queue *q)
{
	_cds_wfq_init(q);
}

static inline CDS_WFQ_DEPRECATED
void cds_wfq_destroy(struct cds_wfq_queue *q)
{
	_cds_wfq_destroy(q);
}

static inline CDS_WFQ_DEPRECATED
void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node)
{
	_cds_wfq_enqueue(q, node);
}

static inline CDS_WFQ_DEPRECATED
struct cds_wfq_node *__cds_wfq_dequeue_blocking(struct cds_wfq_queue *q)
{
	return ___cds_wfq_dequeue_blocking(q);
}

static inline CDS_WFQ_DEPRECATED
struct cds_wfq_node *cds_wfq_dequeue_blocking(struct cds_wfq_queue *q)
{
	return _cds_wfq_dequeue_blocking(q);
}

#else /* !_LGPL_SOURCE */

extern CDS_WFQ_DEPRECATED
void cds_wfq_node_init(struct cds_wfq_node *node);

extern CDS_WFQ_DEPRECATED
void cds_wfq_init(struct cds_wfq_queue *q);

extern CDS_WFQ_DEPRECATED
void cds_wfq_destroy(struct cds_wfq_queue *q);

extern CDS_WFQ_DEPRECATED
void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node);

/* __cds_wfq_dequeue_blocking: caller ensures mutual exclusion between dequeues */
extern CDS_WFQ_DEPRECATED
struct cds_wfq_node *__cds_wfq_dequeue_blocking(struct cds_wfq_queue *q);

extern CDS_WFQ_DEPRECATED
struct cds_wfq_node *cds_wfq_dequeue_blocking(struct cds_wfq_queue *q);

#endif /* !_LGPL_SOURCE */

#ifdef __cplusplus
}
#endif

#endif /* _URCU_WFQUEUE_H */
Commit	Line	Data
	1	// SPDX-FileCopyrightText: 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	2	//
	3	// SPDX-License-Identifier: LGPL-2.1-or-later
	4
	5	#ifndef _URCU_WFQUEUE_H
	6	#define _URCU_WFQUEUE_H
	7
	8	/*
	9	* Userspace RCU library - Queue with Wait-Free Enqueue/Blocking Dequeue
	10	*/
	11
	12	#include <pthread.h>
	13	#include <urcu/compiler.h>
	14
	15	#ifdef __cplusplus
	16	extern "C" {
	17	#endif
	18
	19	#ifndef CDS_WFQ_DEPRECATED
	20	#define CDS_WFQ_DEPRECATED \
	21	CDS_DEPRECATED("urcu/wfqueue.h is deprecated. Please use urcu/wfcqueue.h instead.")
	22	#endif
	23
	24	/*
	25	* Queue with wait-free enqueue/blocking dequeue.
	26	* This implementation adds a dummy head node when the queue is empty to ensure
	27	* we can always update the queue locklessly.
	28	*
	29	* Inspired from half-wait-free/half-blocking queue implementation done by
	30	* Paul E. McKenney.
	31	*/
	32
	33	struct cds_wfq_node {
	34	struct cds_wfq_node *next;
	35	};
	36
	37	struct cds_wfq_queue {
	38	struct cds_wfq_node head, *tail;
	39	struct cds_wfq_node dummy; /* Dummy node */
	40	pthread_mutex_t lock;
	41	};
	42
	43	#ifdef _LGPL_SOURCE
	44
	45	#include <urcu/static/wfqueue.h>
	46
	47	static inline CDS_WFQ_DEPRECATED
	48	void cds_wfq_node_init(struct cds_wfq_node *node)
	49	{
	50	_cds_wfq_node_init(node);
	51	}
	52
	53	static inline CDS_WFQ_DEPRECATED
	54	void cds_wfq_init(struct cds_wfq_queue *q)
	55	{
	56	_cds_wfq_init(q);
	57	}
	58
	59	static inline CDS_WFQ_DEPRECATED
	60	void cds_wfq_destroy(struct cds_wfq_queue *q)
	61	{
	62	_cds_wfq_destroy(q);
	63	}
	64
	65	static inline CDS_WFQ_DEPRECATED
	66	void cds_wfq_enqueue(struct cds_wfq_queue q, struct cds_wfq_node node)
	67	{
	68	_cds_wfq_enqueue(q, node);
	69	}
	70
	71	static inline CDS_WFQ_DEPRECATED
	72	struct cds_wfq_node __cds_wfq_dequeue_blocking(struct cds_wfq_queue q)
	73	{
	74	return ___cds_wfq_dequeue_blocking(q);
	75	}
	76
	77	static inline CDS_WFQ_DEPRECATED
	78	struct cds_wfq_node cds_wfq_dequeue_blocking(struct cds_wfq_queue q)
	79	{
	80	return _cds_wfq_dequeue_blocking(q);
	81	}
	82
	83	#else /* !_LGPL_SOURCE */
	84
	85	extern CDS_WFQ_DEPRECATED
	86	void cds_wfq_node_init(struct cds_wfq_node *node);
	87
	88	extern CDS_WFQ_DEPRECATED
	89	void cds_wfq_init(struct cds_wfq_queue *q);
	90
	91	extern CDS_WFQ_DEPRECATED
	92	void cds_wfq_destroy(struct cds_wfq_queue *q);
	93
	94	extern CDS_WFQ_DEPRECATED
	95	void cds_wfq_enqueue(struct cds_wfq_queue q, struct cds_wfq_node node);
	96
	97	/* __cds_wfq_dequeue_blocking: caller ensures mutual exclusion between dequeues */
	98	extern CDS_WFQ_DEPRECATED
	99	struct cds_wfq_node __cds_wfq_dequeue_blocking(struct cds_wfq_queue q);
	100
	101	extern CDS_WFQ_DEPRECATED
	102	struct cds_wfq_node cds_wfq_dequeue_blocking(struct cds_wfq_queue q);
	103
	104	#endif /* !_LGPL_SOURCE */
	105
	106	#ifdef __cplusplus
	107	}
	108	#endif
	109
	110	#endif /* _URCU_WFQUEUE_H */